package com.util.mail;

import javax.activation.DataSource;
import java.io.*;

/**
 * A simple DataSource for demonstration purposes.
 * This class implements a DataSource from:
 * an InputStream
 * a byte array
 * a String
 *
 * @author John Mani
 * @author Bill Shannon
 * @author Max Spivak
 */
public class ByteArrayDataSource
        implements DataSource {
    private byte[] data; // data
    private String type; // content-type

    /* Create a DataSource from an input stream */
    public ByteArrayDataSource(InputStream is, String type) {
        this.type = type;
        try {
            ByteArrayOutputStream os = new ByteArrayOutputStream();
            int ch;

            while((ch = is.read()) != -1)

                // XXX - must be made more efficient by
                // doing buffered reads, rather than one byte reads
                os.write(ch);
            data = os.toByteArray();

        }
        catch(IOException ioex) {
        }
    }

    /* Create a DataSource from a byte array */
    public ByteArrayDataSource(byte[] data, String type) {
        this.data = data;
        this.type = type;
    }

    /* Create a DataSource from a String */
    public ByteArrayDataSource(String data, String type) {
        try {
            // Assumption that the string contains only ASCII
            // characters!  Otherwise just pass a charset into this
            // constructor and use it in getBytes()
            this.data = data.getBytes("iso-8859-1");
        }
        catch(UnsupportedEncodingException uex) {
        }
        this.type = type;
    }

    /**
     * Return an InputStream for the data.
     * Note - a new stream must be returned each time.
     */
    public InputStream getInputStream() throws IOException {
        if(data == null)
            throw new IOException("no data");
        return new ByteArrayInputStream(data);
    }

    public OutputStream getOutputStream() throws IOException {
        throw new IOException("cannot do this");
    }

    public String getContentType() {
        return type;
    }

    public String getName() {
        return "dummy";
    }
}
